Add CMake tests

test/cmake_subdir_test/CMakeLists.txt

@@ -2,7 +2,7 @@
 # Distributed under the Boost Software License, Version 1.0.
 # See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt
 
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.5...3.16)
 
 project(cmake_subdir_test LANGUAGES CXX)
 
@@ -10,7 +10,7 @@ add_subdirectory(../.. boostorg/variant2)
 add_subdirectory(../../../config boostorg/config)
 add_subdirectory(../../../mp11 boostorg/mp11)
 
-add_executable(quick quick.cpp)
+add_executable(quick ../quick.cpp)
 target_link_libraries(quick Boost::variant2)
 
 enable_testing()

test/cmake_subdir_test/quick.cpp

@@ -1,15 +0,0 @@
-
-// Copyright 2019 Peter Dimov.
-//
-// Distributed under the Boost Software License, Version 1.0.
-// http://www.boost.org/LICENSE_1_0.txt
-
-#include <boost/variant2/variant.hpp>
-
-using namespace boost::variant2;
-
-int main()
-{
-    variant<float, int> v( 2 );
-    return get<1>( v ) == 2? 0: 1;
-}